JEE Math Practice Question
If $$A$$ is a $$3 \times 3$$ non-singular matrix such that $$AA'=A'A$$ and $$B = {A^{ - 1}}A',$$ then $$BB'$$ equals:
- A.$${B^{ - 1}}$$
- B.$$\left( {{B^{ - 1}}} \right)'$$
- C.$$I+B$$
- D.$$I$$
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